Stoichiometric equations vs RandleSimulation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stoichiometric equations
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Stoichiometric Equation balances chemical reaction equations for you — no trial and error, no guessing. Enter the reactants and the products, tap Balance equation, and the app returns the stoichiometric coefficients as the smallest set of whole numbers. Balancing an equation means making sure that the same number of atoms of every element appears on both sides. For a reaction such as 2Na + Cl₂ = 2NaCl you can still do that in your head. For e.g 3As₂S₃ + 28HNO₃ + 4H₂O = 6H₃AsO₄ + 9H₂SO₄ + 28NO, trial and error quickly stops being practical. That is exactly where this app takes over. HOW IT WORKS Instead of guessing, the app treats the equation the way a mathematician would: every unknown coefficient becomes a variable, the atom counts for each element become one linear equation, and the resulting system is solved with Gaussian elimination. The coefficient matrix is transformed into reduced row echelon form and the solution is scaled to the smallest whole-number coefficients. The complete derivation is included in the app, step by step, with a fully worked example — so you can not only get the answer, but also understand how it is found. FEATURES • Balances simple reactions and long, complex equations alike • Nested grouping with parentheses ( ), square brackets [ ] and braces { } • More than 90 chemical elements, written with the international IUPAC symbols • Results in the smallest whole-number coefficients • Clear, formatted output: proper subscripts, highlighted coefficients, monospaced layout • Long results are wrapped automatically to fit your screen • Precise error messages — unbalanced brackets, unknown element symbol, non-balanceable equation and more, each named instead of a vague "invalid input" • A collection of ready-made example equations: tap one and it is solved instantly • Built-in theory section explaining the mathematics behind the solver • German and English interface, chosen automatically from your device language • Optimised for iPhone and iPad, in portrait and landscape BUILT-IN EXAMPLES The app ships with examples ranging from textbook reactions to equations that would take a very long time by hand,
RandleSimulation
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This simulation should assist you to gain a greater understanding of the relationship glucose and fatty acids within a cell. It is a gut feeling estimate based on the documentation and I make no claims as to the accuracy. I challenge those with a greater understanding of the subject to develop a getter simulation to help advance the education.
Screenshots
Verdict
The clearest difference is update cadence: RandleSimulation at every 4 days against Stoichiometric equations's every 3 months. RandleSimulation also leads on iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Stoichiometric equations ships an update every 3 months, RandleSimulation every 4 days. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.
| Parameter | Stoichiometric equations | RandleSimulation |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 78 MB |
| Age rating | 9+ | 4+ |
| Developer | Peter Sauer | Brian Dockerty |
In-app purchases
Stoichiometric equations
No in-app purchases
RandleSimulation
No in-app purchases
Questions
Is Stoichiometric equations free?
Is RandleSimulation free?
Do Stoichiometric equations or RandleSimulation have ads?
Which is updated more often, Stoichiometric equations or RandleSimulation?
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